Investments in Partially Owned Entities (Urban Edge Properties and PREIT Associates L.P.) (Details) $ / shares in Units, $ in Thousands	9 Months Ended
Sep. 30, 2016 USD ($) $ / shares shares
PREIT Associates
Schedule Of Equity Method Investments [Line Items]
Operating Partnership Units Owned \| shares	6,250,000
Equity method ownership percentage	8.00%
Closing share price (in dollars per share) \| $ / shares	$ 23.03
Equity Method Investment fair Value	$ 143,938
Excess of investee's fair value over carrying amount	19,638
Excess of investee's carrying amount over equity in net assets	$ 66,596
Urban Edge Properties
Schedule Of Equity Method Investments [Line Items]
Operating Partnership Units Owned \| shares	5,717,184
Equity method ownership percentage	5.40%
Closing share price (in dollars per share) \| $ / shares	$ 28.14
Equity Method Investment fair Value	$ 160,882
Excess of investee's fair value over carrying amount	$ 135,065

Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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Amount of fair value of reporting unit in excess of carrying amount.

+ References

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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- Definition

Number of Operating Partnership Units Received From Buyer

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